Dual bandwidth autozero loop for voice frequency codec

Details Dual bandwidth autozero loop for voice frequency codec Dual bandwidth autozero loop for voice frequency codec

H - Electricity

03

M

354/50, 354/70

H03M 1/00 (2006.01)

Patent

CA 1180448

ABSTRACT OF THE DISCLOSURE An autozero loop for eliminating offsets in the analog to digital converter section of a voice frequency coder-decoder (CODEC) utilizing an array of capacitors and a linear resistor string. The autozero loop functions with a relatively small time constant to null offsets quickly during the power-up phase of CODEC operation and with a higher time constant after the power up phase. A dual bandwidth sub-circuit in the loop is connected to a voltage generator and controlled by signals from a logic circuit to operate at different bandwidths and thus provide different off- set cancelling feedback signals during the power-up and normal operating phases.

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